docs: def get_extension_classes():
      """
      Hotdoc's setuptools entry point
      """
      res = [SyntaxHighlightingExtension, SearchExtension, TagExtension,
             DevhelpExtension, LicenseExtension, GitUploadExtension,
             EditOnGitHubExtension]
  
      if sys.version_info[1] >= 5:
          res += [DBusExtension]
  
      try:
          from hotdoc.extensions.c.c_extension import CExtension
          res += [CExtension]
      except ImportError:
          pass
  
      try:
          from hotdoc.extensions.gi.gi_extension import GIExtension
          res += [GIExtension]
      except ImportError:
          pass
  
      return res